Mohamed is starting a new business. Before selling anything, he bought a motor van for $3500, a
market stall for $2000 and inventories for $1100. He did not pay in full for his inventories and still
owes $1000 for them. He borrowed $4000 from Ibrahim. After the above, he has $400 cash in hand
and $1000 cash at bank. Calculate the amount of his Capital.